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Study of confined coherent acoustic phonon modes in a free-standing cubic GaN membrane by femtosecond spectroscopy

Chuan He 1 Martin Grossmann 1 Delia Brick 1 Martin Schubert 1 Sergei Novikov 2 C. Thomas Foxon 2 Vitali Goussev 3 Anthony Kent 2 Thomas Dekorsy 1
1 Department of Physics [Konstanz]
2 School of Physics and Astronomy [Nottingham]
3 LAUM - Laboratoire d'Acoustique de l'Université du Mans
Abstract : Confined longitudinal coherent acoustic phonon modes are excited and detected in a sub-μm-thick free-standing cubic GaN membrane by femtosecond pump-probe spectroscopy. After fs laser excitation, Brillouin oscillation and thickness oscillation with frequencies up to 100 GHz are observed and studied in the time domain. We found an initial expansion of the membrane upon optical excitation at 400 nm. Our experimental results confirmed earlier existing theoretical predictions and experimental observations that the hydrostatic deformation potential of cubic GaN is positive.
Keywords : Reflectivity spectra Elastic modulus Hydrostatics Femtosecond lasers Wave forms Acoustical properties Ultrafast laser spectroscopy Optical properties Phonons Pump probe spectroscopy
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https://hal-univ-lemans.archives-ouvertes.fr/hal-02535968
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Soumis le : mardi 7 avril 2020 - 18:52:00
Dernière modification le : vendredi 30 avril 2021 - 15:37:06

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UNIV-LEMANS | CNRS | LAUM

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Chuan He, Martin Grossmann, Delia Brick, Martin Schubert, Sergei Novikov, et al.. Study of confined coherent acoustic phonon modes in a free-standing cubic GaN membrane by femtosecond spectroscopy. Applied Physics Letters, American Institute of Physics, 2015, 107 (11), pp.112105. ⟨10.1063/1.4931495⟩. ⟨hal-02535968⟩

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